Filia Ul Copt フィリア＝ウル＝コプト | Slayers スレイヤーズ (Pony/Illustrious)

Well, it was tricky but I think this one is okay. For her appearance:

FiliaUC, long hair,

and for her outfit:

cone hat, hair ornament, pink dress, white cloak, brooch, gloves, boots,

Other tags you may find useful:

retro artstyle, tail, tail bow, frilled thigh strap, weapon, mace

Since there is almost no art of her outside of her normal attire, it can be hard to get her into other clothes, (especially getting rid of her huge earrings, tagged as "hair ornament") and her likeness may suffer for it too. But it can be done, just add them to negatives, add emphasis, and pray.

Illustrious version note: Her mace is not drawn well at all and looks like a comically large spiked ball most of the time. Her cloak is also hard to get rid of in particular.